[pydotorg-www] Editing the alternative Python implementations page

[Max B]

Hi all,

I'm new here -- just made the account MaxBernstein. I'd like to add
Skybison (https://github.com/tekknolagi/skybison) to the list of
Python implementations
(https://wiki.python.org/moin/PythonImplementations).

Full disclosure: I used to work full-time on Skybison.

Cheers,
Max